Electric locomotive



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F. W. DEAN. ELECTRIC LOGOMOTIVE.

No. 439,345. Pate nted Oct. 28; 1890.

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UNITED STATES PATENT OFFICE.

FRANCIS W. DEAN, OF CAMBRIDGE, MASSACHUSETTS.

ELECTRIC LOCOMOTIVE.

SPECIFICATION forming part of Letters Patent No. 439,345, dated October 28, 1890. Application filed July 15, 1890. Serial No. 353,854. (No model.)

To all whom it may concern:

Be it known that I, FRANCIS W. DEAN, of Cambridge, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Electric Locomotives, of which the following, taken in connection with the accompanying drawings, is a specification.

My invention relates to electric locomoti ves and it consists in certain novel features of construction, arrangement, and combination of parts, which will be readily understood by reference to the description of the drawings and to the claimshereinafter given, and in which my invention is clearly pointed out.

Figure 1 is a sectional side elevation of a machine illustrating my invention. Fig. 2 is an end elevation of the same; and Fig. 3 is a sectional side elevation of a modified form of my invention, in which no gears are used.

In the drawings, A is the main truck-frame, having mounted in suitable bearings therein the axles a and a, each having secured thereon a pair of wheels B or B.

A is a secondary frame supported by and connecting the side frames A and provided with bearings A in which is mounted the shaft 1), having firmly secured thereon the spur gear-wheel C, the teeth of which are preferably made of Wood set in a mortised rim, and the grooved rope-pulley D.

E and E are two stands or frames mounted upon and firmly secured to the frame A and provided at their upper ends with the bearings E ,in which is mounted the shaft 0, upon which are firmly secured the armature F of an electric motor and the pinion F',the teeth of which engage with and impart motion to the cog-wheel C. The axles a and a have firmly secured thereon the grooved rope-pulleys G and G, respectively.

H H and I I are two pairs of levers, one of each pair being pivoted at its lower and inner end to the stand E and the other of each pair being pivoted to a stand J or J in axial line with thepivotal connection to the stand E, the opposite or outer ends of said levers being pivoted to the hubs H and I, respectively. The levers H H are connected together near the middle of their lengths by a fixed shaft d, upon which is mounted, so as to revolve thereon, the grooved binder-pulley K, and in like manner the levers I I are connected together by the fixed or non-revoluble shaft (1, upon which is mounted, so as to be revoluble thereon, the grooved binder-pulley K.

The frame A has bolted to each end thereof a two-armed stand L or L, in the outer ends of which are formed bearings in which are mounted the trunnioned bosses or hubs e and e, respectively, in which are set the threaded rods for f, the upper ends of which are fitted to guide-bearings in the hubs H and I, respectively.

The rods fand f have'iitted thereon the threaded collars g and g and binding-nuts h and h, respectively, and a coiled spring 1; surrounds the rod f between the hub H and the collar g, and a similar spring '2" surrounds the rod f between the hub I and the collar g, the tensions of said springs serving to move the outer ends of the levers H and I and the pulleys K and K upward, so as to take up any slack there may be in the belts and keep them taut at all times. A series of endless ropes j j, preferably made of rawhide, pass over the pulleys K and K and under and partly around the pulleys D, G, and G.

N N are the field-magnet pole-pieces set in fixed positions in the yoke-plate O, which in turn is secured in a fixed position on the frame A, and O O are the coils of conducting-wire surrounding said pole-pieces.

- The operation of my invention will be readily understood from the foregoing without further description here.

The advantages of my invention are, first, greater accessibility of the parts of the mechanism and less exposure to dust and grit due to placing the motor above the truck-frame instead of beneath it, and, second, a considerable reduction in the noise caused by the running of the motor, due to a reduction of the number of gear-wheels used or the entire dispensing with the use of gear-wheels. In some cases I propose to mount the driving rope-pulley directly upon the motor-shaft and dispense with the gear and pinion,.as shown in Fig. 3. This can readily be done by the employment of a slow-running motor, and by doing away with the use of gears altogether a great advantage will be obtained in the cost of construction and in the greater stillness with which the locomotive can be run.

I claim- 1. In an electric locomotive, the combination, with the truck-frame and its axles and supporting-Wheels, of an electric motor having a revoluble shaft and mounted upon and movable verticallywith said frame,a system of pulleys, each provided with a series of circumferential grooves, and a series of ropes con structed and arranged to transmit the motion of the motor-shaft to the axles and Wheels, one of said pulleys being constructed and arranged to be automatically adjustable for taking up the slack of the belts.

2. In an electric locomotive, the combination, with the truck-frame and its axles and supporting-wheels, of an electric motorhaving a revoluble shaft and mounted upon and movable vertically With said frame,a second shaft mounted upon said frame parallel with the axles and motor-shaft, a gear-Wheel and pinion connecting said second shaft and the motor-shaft,a rope-pulleymounted on said second shaft, a similar pulley mounted on each axle,

two binder-pulleys mounted on journals carried by pivoted lever-frames, a series of endless ropes, each connecting all of said pulleys, and springs arranged to automatically press said binder-pulleys in a direction to keep said belts taut.

3. The combination, in an electric locomotive, of the truck-frame A A, the electric motor F N 0, its shaft 0, the pinion F, the-shaft b, the gear-Wheel O, the lever-frames H H and I I, the grooved pulleys D, G, G, K, and K, the forked stands L and L, the pivoted threaded rods f and f, the swiveled hubs H and I, the adjustable collars g and g, a series of endless ropes jj, and the springs 2' and 7;, all constructed, arranged, and operating substantially as described.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 9th day of July, A. D. 1890.

FRANCIS W. DEAN.

Witnesses:

N. O. LOMBARD, WALTER E. LOMBARD. 

